I don't know if there are similar shows in the U.S, but here in Canada, our Slice network carries several shows about weight loss - X-Weighted, Bulging Brides, and The Last 10 Pounds Bootcamp - that are not competition-based. Tommy Europe is the trainer for the last two shows and his approach is very aggressive, similar to Jillian's style. Besides the fact these weight-loss shows don't pit people against each other, they also don't feature the morbidly obese (X-Weighted has the heavier people, but I haven't seen one that has anyone who needs to lose more than 100 lbs). They are just as entertaining as TBL (I have to confess Bulging Brides is pretty funny, it's about women who can't wiggle into their wedding gowns and have to drop weight quickly). The thing about TBL is that it's a reality show first and a weight-loss show second.
The overriding positive aspect to TBL's style is that the majority of the people who do appear on the show manage to lose weight, regardless of when they get booted off the ranch.